<!DOCTYPE html>
<html>
<head>
  <title>background-size: cover;</title>
  <style type="text/css">
#outer
{
  border: 10px solid black;
  width: 64px;
  height: 128px;
  background-image: url(aqua-32x32.png);
  background-repeat: no-repeat;
  background-size: cover;
}
  </style>
</head>
<body>
<div id="outer"></div>
</body>
</html>
